Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: e3b94346c519625c6ac206a57c86a5dd9add3f67
https://github.com/WebKit/WebKit/commit/e3b94346c519625c6ac206a57c86a5dd9add3f67
Author: Alan Baradlay <[email protected]>
Date: 2026-05-12 (Tue, 12 May 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/compat/webkit-box-z-index-expected.html
A LayoutTests/imported/w3c/web-platform-tests/compat/webkit-box-z-index.html
M Source/WebCore/style/StyleAdjuster.cpp
Log Message:
-----------
[webkit-box] Allow z-index on static display:-webkit-box items
https://bugs.webkit.org/show_bug.cgi?id=314629
Reviewed by Antti Koivisto.
<div style="display: -webkit-box;">
<div style="z-index: 1;">...</div>
</div>
The child should get a layer (stacking context) from z-index: 1, but it does
not. With display: flex it works correctly.
The style adjuster decides whether to honor z-index on non-positioned elements
by checking if the parent is a flex/grid container. A flex item with z-index
creates a stacking context even without position: relative/absolute. The check
used isFlexibleOrGridFormattingContextBox() which only covers modern flex
(display: flex) and grid - not the deprecated -webkit-box.
* Source/WebCore/style/StyleAdjuster.cpp:
(WebCore::Style::Adjuster::adjust):
Canonical link: https://commits.webkit.org/313081@main
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